We just put in a raised flower bed on the back of our house. The bed is approx 12 ft long by 10 ft wide. It butts up to the porch which is 5 ft off the ground. I'd like to put flowering bushes against the house, but don't want them growing over 5ft tall. We live in middle tennessee and would like something that can withstand the cold and possibly not lose it's leaves during the winter, but flower in the spring/summer. Any ideas?